No seriously. I’m not sure what it’s like where the author lives, but here in South Africa if you’re broke you wouldn’t spend $3 on fast food. You’d spend your $3 on 4 loaves of bread, totalling roughly 6 pounds in weight — or 64 slices — of life preserving wheat-based food.
I’d love for you to elaborate on which part of my response does not make sense, because I honestly may learn something. Perhaps McDonalds is the cheapest form of food where the author lives? I’d love to know.